Both of those wide-bandwidth pulses and temporal walk-off bring about a discount while in the conversion efficiency, in addition to worsen the optical high quality of the next harmonic pulses. The appropriate crystal thickness must be selected to minimize both effects.
The selection of the most suitable crystal materials for a presented software is frequently far from trivial; it should include the thought of many features. By way of example, a high nonlinearity for frequency conversion of ultrashort pulses will not enable In the event the interaction duration is strongly confined by a significant team velocity mismatch as well as the lower injury threshold limits the relevant optical intensities.
Thorlabs offers a good selection of optics optimized for use with femtosecond and picosecond laser pulses. You should see down below To find out more.
So that you can use the required CW hurt threshold of an optic, it's important to learn the following:
Usually, the crystal material should have a high optical transparency for all wavelengths concerned �?for instance, for pump, sign and idler in an optical parametric amplifier.
A number of things can influence the functionality of BBO crystals. These consist of temperature, humidity, and the caliber of the incident mild. Suitable dealing with and storage may help keep the crystal’s effectiveness. Temperature can influence the section-matching situations of BBO crystals, which in turn has an effect on their performance in frequency conversion programs.
When laser light-weight is concentrated to some location, the diameter of your beam waistline would be the focal spot sizing, and the speed at which the light diverges from the beam waistline is associated with the Rayleigh variety (zR).
Nonlinear Crystals of either β-barium borate (BBO) or lithium triborate (LBO) are employed for frequency conversion of laser resources. BBO crystals characteristic thicknesses from 0.2mm to 0.5mm to attenuate team velocity mismatch and are ideal for frequency doubling or tripling of Ti:Sapphire and Yb:doped laser pulses. The significant and noncritical section matching LBO crystals are ideal for second or third harmonic generation of Nd:YAG and Yb:doped lasers.
For customer comfort the crystals is often mounted in an one" anodized aluminum (Al) mount. The mounted crystals could be additional mounted in a standard 1" mirror mount for being angle tuned for stage matching (as demonstrated to the appropriate). Drinking water-cooled mounts for top electrical power purposes might be provided on ask for.
Little acceptance angle: BBO crystals have a small acceptance angle that restrictions the input gentle beam’s gentle beam divergence and prime click here manner quality for effective regularity conversion.
This property is particularly effective in purposes that involve superior-power lasers or intense gentle sources, as it makes certain the longevity and trustworthiness in the crystal in such demanding disorders.
The crystal axis is c. The chief ray is parallel into the course utilized to measure the tuning angle (θ), that is optimized during period matching. Conversion effectiveness is optimized for rays parallel to the chief ray and worse for rays at much larger angles (ψ) into the Main ray.
The wavelength of the light made use of along with the angle at which it enters the crystal may effect the crystal’s general performance. Correct alignment and dealing with with the crystal are essential to obtaining exceptional performance.
Our crystals are Employed in a wide range of purposes, together with a variety of sorts of nonlinear frequency conversion and electro-optics, but in addition quantum engineering.